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Tire Fundamentals
Federal law requires tire manufacturers to place standardized information on the sidewall of all
tires. This information identifies and describes the fundamental characteristics of the tire and also
provides a tire identification number for safety standard certification and in case of a recall.
NOTE: Buy only tires recommended for travel trailers LT for light trucks or trailers or ST for
trailer use only.
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Information on Passenger Vehicle Tires
Please refer to the diagram.
•
P
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The "P" indicates the tire is for passenger vehicles. NOTE: Passenger car tires are not
recommended for use on trailers, because the capacity ratings are not marked on the
sidewalls of these tires. In the event a passenger car tire is used, the capacity must be
derated by 10%.
•
Next number
-
This three-digit number gives the width in millimetres of the tire from
sidewall edge to sidewall edge. In general, the larger the number, the wider the tire.
•
Next number - This two-digit number, known as the aspect ratio, gives the tire's ratio of
height to width. Numbers of 70 or lower indicate a short sidewall for improved steering
response and better overall handling on dry pavement.
•
R - The "R" stands for radial. Radial ply construction of tires has been the industry
standard for the past 20 years.
•
Next number - This two-digit number is the wheel or rim diameter in inches. If you
change your wheel size, you will have to purchase new tires to match the new wheel
diameter.
•
Next number - This two- or three-digit number is the tire's load index. It is a
measurement of how much weight each tire can support. You may find this information
in your owner's manual. If not, contact a local tire dealer. Note: You may not find this
information on all tires because it is not required by law.
M+S -
The "M+S" or "M/S" indicates that the tire has some mud and snow capability. Most
radial tires have these markings.